Multitasking Scenario 4: 3D Rendering

We received several requests for a 3D rendering multitasking test, so we put one together. For this test, we ran our SPECapc 3ds max 6 benchmark while we had iTunes, Firefox and Newsleecher all running like we have in previous tests. The application focus remained on Firefox to give it the highest scheduler priority, and the results are below:

3D Rendering + Multitasking Environment

Once again, we have one of those situations where the Athlon 64 X2 4400+ is more than twice as fast as the Athlon 64 FX-55. 3ds max is actually one of the best ways to guarantee that you exploit problems with Windows' scheduler in a repeatable fashion. In fact, part of the reason for such huge performance gains for AMD in SYSMark 2004 is this exact type of scenario caused by 3ds max not allowing the Windows scheduler to preempt other running tasks properly. The result here is that single core systems are basically horrendous in performance and system response, while all of the dual core systems actually let you get work done.

What's also interesting is that the performance of the Athlon 64 X2 4400+ is virtually identical with the Athlon 64 FX-55 from our standalone 3ds max test (1.65 vs 1.66). In this benchmark, the Pentium Extreme Edition 840 takes a pretty significant lead, thanks to HT. We see that even with a dual core CPU, there are still some issues to overcome with the OS' scheduler. So, we get an unusually large increase in performance due to HT due to the scheduler being tricked into sending more threads to the CPU rather than attempting to have them preempt one another for CPU time.

Multitasking Scenario 3: Web Browsing Multitasking Scenario 5: Compiling
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  • MDme - Friday, April 22, 2005 - link

    #92

    the difference between an opteron and an a64/fx is as follows:

    opteron - needs ECC memory cache is 1mb it is multiplier locked, COHERENT HT LINKS

    a64 - uses non-registered (non-ecc) memory (which is faster), cache 512k-1mb, multiplier locked

    a64fx - non-ecc memory, 1mb cache, unlocked.

    so opteron's are not a64/fx's but are quite similar. the main difference is the memory type and the COHERENT HT links

    therefore the X2 4400+ is really an opteron (dual core) running at 2.2 with dual 1mb cache but with the COHERENT HT link disabled that uses non-ECC ram.

    performance should therefore be almost identical between one DC opteron 2.2ghz and one A64 X2 4400+ (possibly the X2 will be faster 5%) due to the non-ECC memory which is faster.


    Reply
  • tygrus - Friday, April 22, 2005 - link

    If you use a Opteron 875 then label it as such in all diagrams. You can make a note that the Athlon64 X2 4400+ will perform similarly to the Opteron 875. The differences in MB and RAM will affect results and so a direct re-labelling should not be made.
    Good database, multimedia, data analysis should make good use of multi-core/multi-CPU systems. When I mention data analysis I'm talking about software like SAS 9.1.3 and SAP. Even SAS is only threaded for a few tasks and is a big hassel to pipeline one step into another.
    Reply
  • Some1ne - Thursday, April 21, 2005 - link

    Good article overall, although I question the validity of declaring that an Opteron 875 is roughly equivalent to an Athlon 64 4400+. I could be wrong, but surely there must be significant architectural differences between the server-class chip (top of the line server-class chip no less) and the desktop Athlon 64? If not then why the price premium for Opterons, and why don't manufacturers just find a way to kludge the Athlon64 to work in MP configurations as in theory if they are really equivalent when run at the same clock speed, it would be much more cost effective to use kludged Athlon 64's, and it would also let higher performance levels to be reached as the dual-core Athlon64's are slated to run at one clock increment higher than the fastest dual-core Opteron's? So anyways, is it *really* valid to treat an Opteron as being essentially equivalent to a similarly clocked Athlon64? As much as I love finally seeing Intel chips trounced pretty much across the board, it seems to me like the results could potentially be inaccurate given that an Opteron 875 was used and simply "labeled" as an Athlon64 4400+. Reply
  • Cygni - Thursday, April 21, 2005 - link

    #89... seeing as how the Opty x75 and A64 X2 are based on functionally identical cores, thats not too likely at all. What DOES seem likely to me reading this article is that BIOS updates, and X2 support on 939 boards, is going to be a very interesting story to follow. It doesnt look like its too easy to get a solid AMD Dual Core BIOS if even Tyan is struggling, of all board mfts. May give a fiesty smaller board mft a chance to slam the bigboys and grab marketshare (such as ECS with the K7S5A). Reply
  • Jason Clark - Thursday, April 21, 2005 - link

    saratoga, waah? There are similarities between C# and C++. While agree it's java'ish as well, it definitely has similarties to c++. One could say c# shaes similarities with c/c/c++.

    read away:

    http://www.mastercsharp.com/article.aspx?ArticleID...

    http://www.csharphelp.com/archives/archive138.html

    "C# is directly related to C and C++. This is not just an idea, this is real. As you recall C is a root for C++ and C++ is a superset of C. C and C++ shares several syntax, library and functionality." Quoted from above.

    L8r.




    Reply
  • Jep4444 - Thursday, April 21, 2005 - link

    I've spoken to a few people from XS who have Engineering Samples of the Athlon X2s and all im hearing is that arent nearly as good as the dual core Opterons, they were apparently rushed Reply
  • xtknight - Thursday, April 21, 2005 - link

    #86 - the r_smp cvar was disabled in quake3 in a patch, for a reason i don't know. i confirmed this by having quake3 crash on my p4 HT CPU with that setting enabled. as for doom3, i'm not sure. i'm guessing it's not implemented well enough yet... Reply
  • Chuckles - Thursday, April 21, 2005 - link

    #83:
    "Real gamers" may use a single core, but I have been hankering for duallies since I tried an older dual G4 to my newer single G4. Even on the crappy MaxBus, I could browse the web, chat, do "real work" and game, without having everything go to pot when a bolus of e-mail came in.
    When you buy a dualie of any type, you buy the ability to do other stuff while you computer working on its latest task. Remember that when you get lagged while Outlook downloads your latest spam.

    Reply
  • Googer - Thursday, April 21, 2005 - link

    Why wern't there any SMP Tests done on Quake 3 engine, after all it is said to be multithreaded.

    Also, Carmack said during the devlopment of DOOM3 that the engine was going to support multiple processors, did this ever happen? Does anyone know what the command might be for D3 console to enable SMP, like it's cousin? How much truth is there to this?
    Reply
  • Nighteye2 - Thursday, April 21, 2005 - link

    Add to all the arguments that we can potentially see programs taking advantage of this quite soon...without the effort required to implement full multi-threading, game functions could be assigned to use the other processor if it's available. For example, AI can be done by one core, while the other core does the rest of running the game.
    Reply

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